Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca9922a22c757d5…

MALICIOUS

PDF

76.5 KB Created: 2021-03-31 18:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a6bb48a51757097ab7e7fc0f0fb472 SHA-1: 929247f478409faf97ad7afc14cc872601e528d8 SHA-256: 9ca9922a22c757d535583750665f052a537ea6443a0ab462a67ff3923fbc2987
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/123?utm_term=pokemon+games+for+gba+hack
    • http://pubgmobiie.com/norcold_n611_door_panelshmk70.pdf
    • http://giwudogor.scienceontheweb.net/noletijexex.pdf
    • http://stixlife.info/gloomhaven_second_edition_rulesh7ikc.pdf
    • http://lebuvowune.getenjoyment.net/10158028196.pdf
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/kufetedujisipepi.pdf
    • http://zootime.store/sc_dmv_driving_test_in_spanishjj9su.pdf
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/2306478.pdf
    • https://vilegewadaw.weebly.com/uploads/1/3/5/3/135324537/nedapasusu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_fd5f14d5e47840929f04b324ad686ff5.pdf?index=true
    • https://s3.amazonaws.com/fofeguj/walisivetirededaxif.pdf
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_fc7a48b6fbd4461abb8ac1e4594ef9b8.pdf?index=true
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_49ad2aced3dc4fa2b55a1ac2e36ad100.pdf?index=true
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_16eb9930c29c47b2ac43ef58d3e325ad.pdf?index=true
    • http://lamupimifuban.onlinewebshop.net/solicited_and_unsolicited_application_letter.pdf
    • https://s3.amazonaws.com/jinabom/42184894156.pdf
    • http://tavoxelelenasi.onlinewebshop.net/book_review_of_the_alchemist.pdf
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_a032388d068341838d1efdcce5c44269.pdf?index=true
    • https://s3.amazonaws.com/fusidejebi/alzheimer_s_disease_malayalam.pdf
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_8582b3e80efa4460a6a3c2b84faccbef.pdf?index=true
    • https://s3.amazonaws.com/zolerazowubow/elementary_statistics_a_step_by_step_approach_solutions_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea14.bin
bcae88ddf17983ec3cff74e0581191cdc9d3946a27583384cc38303048abd14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5468 bytes
font_01_sfnt_off0000fc93.bin
3b6358b3822a4d5b93a9aadfec547c00db36462729c5af883d49b37b29945aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 12000 bytes

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